Webb E L, Straka W F, Phillips C L
Department of Fixed Prosthodontics, University of North Carolina, School of Dentistry, Chapel Hill.
J Prosthet Dent. 1989 May;61(5):624-8. doi: 10.1016/0022-3913(89)90289-8.
A model for observing the three-dimensional pattern of cracking associated with placement of self-threading retentive pins was developed. Four sizes of self-threading pins were placed in extracted posterior tooth samples. The pins were subsequently removed and the samples coated with butyl acetate lacquer except for the pin channel orifice. Samples were immersed in dye solution followed by a demineralization and dehydration process. Samples were placed in methyl salicylate until cleared. Cleared samples were examined for dye penetration into the pin channel and communication with the pulp chamber. Comparisons were made of the patterns created by the four sizes of retentive pins. Results showed that more extensive cracks occurred with the larger size pins and that crack communication with the pulp chamber occurred more frequently with the larger pins.
开发了一种用于观察与自攻固位钉植入相关的三维裂纹模式的模型。将四种尺寸的自攻钉植入拔除的后牙样本中。随后取出钉子，除钉道孔口外，样本用醋酸丁酯漆涂层。样本浸入染料溶液，然后进行脱矿质和脱水处理。样本置于水杨酸甲酯中直至透明。检查透明样本中染料渗入钉道以及与髓腔的连通情况。对四种尺寸固位钉产生的模式进行了比较。结果表明，较大尺寸的钉子会产生更广泛的裂纹，且较大尺寸的钉子与髓腔的裂纹连通更频繁。
